I'm not getting the bug in the code :(. It would be helpful if someone pointed the mistake.

key = {'i' : 1, 'j' : 1,
       'a' : 2, 'b' : 2, 'c' : 2,
       'd' : 3, 'e' : 3, 'f' : 3,
       'g' : 4, 'h' : 4,
       'k' : 5, 'l' : 5,
       'm' : 6, 'n' : 6,
       'p' : 7, 'r' : 7, 's' : 7,
       't' : 8, 'u' : 8, 'v' : 8,
       'w' : 9, 'x' : 9, 'y' : 9,
       'o' : 0, 'q' : 0, 'z' : 0
      }

while True:
    n = raw_input()
    if(int(n) == -1):
        break
    l = int(raw_input())
    d = {}
    ans = []

    for a0 in xrange(l):
        temp = raw_input()
        d["".join([str(key[i]) for i in temp])] = temp

    i = len(n)
    while(i>0):
        if n[0:i] in d.keys():
            ans.append(d[n[0:i]])
            n = n[i:]
            i = len(n)+1
        i-=1

    print "No solution." if len(n) != 0 else " ".join(ans)

43550 // hello
3
hell
he
llo
-1

Thank you very much!